1、December 2013 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 79.040!%*vM“2078342www.din.deDDIN EN 336Structural timber Sizes, permitted deviations;English version EN 336:2013,English translation of DIN EN 336:2013-12Bauholz fr tragende Zwecke Mae, zulssige Abweichungen;Englische Fassung EN 336:2013,Englische bersetzung von DIN EN 336:2013-12Bois de structur
3、e Dimensions, carts admissibles;Version anglaise EN 336:2013,Traduction anglaise de DIN EN 336:2013-12SupersedesDIN EN 336:2003-09www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 9 pages 11.13 DIN EN 336:2013-12 2 A comma is used as the
4、decimal marker. National foreword This document (EN 336:2013) has been prepared by Technical Committee CEN/TC 124 “Timber structures” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Commi
5、ttee), Working Committee NA 005-04-01 AA Holzbau (SpA zu CEN/TC 124, CEN/TC 250/SC 5). Amendments This standard differs from DIN EN 336:2003-09 as follows: a) in the scope, the limit to 300 mm has been deleted so the standard is available for large cross sections; b) the minimum size has been change
6、d from 22 mm to 6 mm; c) in Subclause 4.2, the changes in size due to changes in moisture content are given for hardwoods; d) in Subclause 4.3, the permitted cross sectional deviations are given for thicknesses and widths above 300 mm; e) in Clause 5, moisture content measurement has been specified
7、to be in accordance with the three parts of EN 13183. Previous editions DIN EN 336: 1996-04, 2003-09 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 336 October 2013 ICS 79.040 Supersedes EN 336:2003English Version Structural timber - Sizes, permitted deviations Bois de structure - Dimensions,
8、carts admissibles Bauholz fr tragende Zwecke - Mae, zulssige Abweichungen This European Standard was approved by CEN on 24 August 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national
9、standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version
10、in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
11、 Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUR
12、OPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 336:2013: EEN 336:2013 (E)
13、2 Contents Page Foreword . 3 Introduction 4 1 Scope 5 2 Normative references . 5 3 Terms and definitions 5 4 Sizes for structural timber . 5 4.1 General . 5 4.2 Changes in size due to changes in moisture content 6 4.3 Permitted cross-sectional deviations 6 4.4 Permitted length deviations . 6 5 Moist
14、ure content measurement . 6 Bibliography 7 DIN EN 336:2013-12 EN 336:2013 (E) 3 Foreword This document (EN 336:2013) has been prepared by Technical Committee CEN/TC 124 “Timber structures”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national stan
15、dard, either by publication of an identical text or by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the latest by April 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CE
16、N and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document will supersede EN 336:2003. Compared to EN 336:2003, the following modifications have been made: a) in the scope, the limit to 300 mm is deleted so the standard is available for large cross se
17、ction; b) minimum size changed from 22 mm to 6 mm; c) in subclause 4.2, the changes in size due to changes in moisture content are given for hardwoods; d) in subclause 4.3, the permitted cross sectional deviations are given for thicknesses and widths above 300 mm; e) in Clause 5, moisture content me
18、asurement in accordance with the three parts of EN 13183. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, F
19、inland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 336:2013-12 EN 336:201
20、3 (E) 4 Introduction Target size is the basis for the standard. A method of calculating sizes at other moisture levels is provided. The standard also stipulates a method for the measurement of moisture content. DIN EN 336:2013-12 EN 336:2013 (E) 5 1 Scope This European Standard specifies two classes
21、 of permitted deviations from target sizes for structural timber of softwood and hardwood species. It also specifies the moisture content to be used as a reference point for the measurement of sizes, and gives average values for changes in size due to changes in moisture content. It is applicable to
22、 sawn and prepared square-edged structural timber with parallel edges having sawn thicknesses or widths greater than 6 mm. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references,
23、 only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1309-1, Round and sawn timber Method of measurement of dimensions Part 1: Sawn timber EN 13183-1, Moisture content of a piece of sawn timber Part 1: Determina
24、tion by oven dry method EN 13183-2, Moisture content of a piece of sawn timber Part 2: Estimation by electrical resistance method EN 13183-3, Moisture content of a piece of sawn timber Part 3: Estimation by capacitance method 3 Terms and definitions For the purposes of this document, the following t
25、erms and definitions apply. 3.1 target size size specified (at the reference moisture content), and to which the deviations, which would ideally be zero, are to be related 3.2 deviation difference between actual size and the corresponding target size, making allowance for the difference in size due
26、to difference in moisture content (see Clause 5) 3.3 moisture content amount of water present in timber, expressed as a percentage of the oven-dry mass 4 Sizes for structural timber 4.1 General Sizes shall be measured in accordance with EN 1309-1. For the purposes of this European Standard, the refe
27、rence moisture content is 20 %. NOTE The reference moisture content is the moisture content at which sizes are given. It is different from target moisture contents which are defined in EN 14298. DIN EN 336:2013-12 EN 336:2013 (E) 6 4.2 Changes in size due to changes in moisture content Unless there
28、is evidence to the contrary, it shall be assumed that: for softwoods and poplar, the thickness and width of a piece of timber increase by 0,25 % for every 1,0 % of moisture content higher than 20 % up to 30 %, and decrease by 0,25 % for every 1,0 % of moisture content lower than 20 %; for hardwoods,
29、 the thickness and width of a piece of timber increase by 0,35 % for every 1,0 % of moisture content higher than 20 % up to 30 %, and decrease by 0,35 % for every 1,0 % of moisture content lower than 20 %. The above values are typical, without regard to species. 4.3 Permitted cross-sectional deviati
30、ons In any cross section of each piece of timber, the actual thickness and actual width (corrected for changes due to changes in moisture content) may not deviate from the target size by more than the values given in Table 1 for tolerance class 1 or in Table 2 for tolerance class 2: a) Tolerance cla
31、ss 1 Table 1 Values for tolerance class 1 For thicknesses and widths 100 mm: (-1 +3) mm For thicknesses and widths 100 mm and 300 mm: (-2 +4) mm For thicknesses and widths 300 mm (-3 +5) mm b) Tolerance class 2 Table 2 Values for tolerance class 2 For thicknesses and widths 100 mm: (-1 +1) mm For th
32、icknesses and widths 100 mm and 300 mm: (-1,5 +1,5) mm For thicknesses and widths 300 mm (-2,0 +2,0) mm For large cross sections, deviations from squareness may be given as part of the specifications. The average actual thickness and the average actual width of square-edged timber shall not be less
33、than the target sizes, making allowance for changes in size due to changes in moisture content. 4.4 Permitted length deviations Negative deviations are not permitted. If overlength is likely to be a problem, a limit should be placed in the contract at the time of purchase. 5 Moisture content measurement Moisture content shall be measured in accordance with EN 13183 (part 1 or 2 or 3). DIN EN 336:2013-12 EN 336:2013 (E) 7 Bibliography 1 EN 14298, Sawn timber Assessment of drying quality DIN EN 336:2013-12
